1 /*
2 * Copyright (c) 2010, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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23 */
24
25 #ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
26 #define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
27
28 #include "code/nmethod.hpp"
29 #include "oops/methodData.hpp"
30 #include "runtime/compilationPolicy.hpp"
31 #include "utilities/globalDefinitions.hpp"
32
33 #ifdef TIERED
34
35 class CompileTask;
36 class CompileQueue;
37
38 class SimpleThresholdPolicy : public CompilationPolicy {
39 int _c1_count, _c2_count;
40
41 // Check if the counter is big enough and set carry (effectively infinity).
42 inline void set_carry_if_necessary(InvocationCounter *counter);
43 // Set carry flags in the counters (in Method* and MDO).
44 inline void handle_counter_overflow(Method* method);
45 // Call and loop predicates determine whether a transition to a higher compilation
46 // level should be performed (pointers to predicate functions are passed to common_TF().
47 // Predicates also take compiler load into account.
48 typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level, Method* method);
49 bool call_predicate(int i, int b, CompLevel cur_level, Method* method);
50 bool loop_predicate(int i, int b, CompLevel cur_level, Method* method);
51 // Common transition function. Given a predicate determines if a method should transition to another level.
52 CompLevel common(Predicate p, Method* method, CompLevel cur_level);
53 // Transition functions.
54 // call_event determines if a method should be compiled at a different
55 // level with a regular invocation entry.
56 CompLevel call_event(Method* method, CompLevel cur_level, JavaThread* thread);
57 // loop_event checks if a method should be OSR compiled at a different
58 // level.
59 CompLevel loop_event(Method* method, CompLevel cur_level, JavaThread* thread);
60 void print_counters(const char* prefix, const methodHandle& mh);
61 protected:
62 int c1_count() const { return _c1_count; }
63 int c2_count() const { return _c2_count; }
64 void set_c1_count(int x) { _c1_count = x; }
65 void set_c2_count(int x) { _c2_count = x; }
66
67 enum EventType { CALL, LOOP, COMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };
68 void print_event(EventType type, const methodHandle& mh, const methodHandle& imh, int bci, CompLevel level);
69 // Print policy-specific information if necessary
70 virtual void print_specific(EventType type, const methodHandle& mh, const methodHandle& imh, int bci, CompLevel level) { }
71 // Check if the method can be compiled, change level if necessary
72 void compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread);
73 // Submit a given method for compilation
74 virtual void submit_compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread);
75 // Simple methods are as good being compiled with C1 as C2.
76 // This function tells if it's such a function.
77 inline bool is_trivial(Method* method);
78
79 // Predicate helpers are used by .*_predicate() methods as well as others.
80 // They check the given counter values, multiplied by the scale against the thresholds.
81 template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale, Method* method);
82 template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale, Method* method);
83
84 // Get a compilation level for a given method.
85 static CompLevel comp_level(Method* method);
86 virtual void method_invocation_event(const methodHandle& method, const methodHandle& inlinee,
87 CompLevel level, CompiledMethod* nm, JavaThread* thread);
88 virtual void method_back_branch_event(const methodHandle& method, const methodHandle& inlinee,
89 int bci, CompLevel level, CompiledMethod* nm, JavaThread* thread);
90 public:
91 SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }
92 virtual int compiler_count(CompLevel comp_level) {
93 if (is_c1_compile(comp_level)) return c1_count();
94 if (is_c2_compile(comp_level)) return c2_count();
95 return 0;
96 }
97 virtual CompLevel initial_compile_level() { return MIN2((CompLevel)TieredStopAtLevel, CompLevel_initial_compile); }
98 virtual void do_safepoint_work() { }
99 virtual void delay_compilation(Method* method) { }
100 virtual void disable_compilation(Method* method) { }
101 virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);
102 virtual nmethod* event(const methodHandle& method, const methodHandle& inlinee,
103 int branch_bci, int bci, CompLevel comp_level, CompiledMethod* nm, JavaThread* thread);
104 // Select task is called by CompileBroker. We should return a task or NULL.
105 virtual CompileTask* select_task(CompileQueue* compile_queue);
106 // Tell the runtime if we think a given method is adequately profiled.
107 virtual bool is_mature(Method* method);
108 // Initialize: set compiler thread count
109 virtual void initialize();
110 virtual bool should_not_inline(ciEnv* env, ciMethod* callee) {
111 return (env->comp_level() == CompLevel_limited_profile ||
112 env->comp_level() == CompLevel_full_profile) &&
113 callee->has_loops();
114 }
115 };
116
117 #endif // TIERED
118
119 #endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP